Windows/Mac/Linux (All platforms): Free, cross platform application Tribler offers a new take on BitTorrent, complete with YouTube integration and a recommendation system.

Tribler's thumbnail interface provides a new way to search for and organize your torrents, and the—dare I say it—social aspect, which allows you to tweak your profile, connect with friends and give and receive recommendations, is an interesting idea. In all, Tribler feels like much more of an old school P2P application than BitTorrent client, so if you yearn for the P2P of yesteryear, it may be worth a try. It's going to take a bit more than this for me to ditch my barebones favorite, uTorrent, but Tribler's feature set is certainly an interesting departure from what we're used to seeing out of BitTorrent clients. Tribler is free to download, works on Windows, Mac, and Linux.